OXNARD, Calif. — The Cowboys haven’t won anything yet, but coach Jason Garrett received his first cooler full of ice water over his head.

And it was he who dumped it.

Garrett took part Thursday in the ALS Association’s Ice Bucket Challenge after the Cowboys’ last afternoon practice of training camp. The Ice Bucket Challenge — a fund-raising mission — has swept the nation and gone viral, with celebrities everywhere dumping ice water over their heads and challenging others to do the same.

Cowboys Tony Romo and Dez Bryant have already accepted the challenge.

“It’s fun to be a part of it,” Garrett said. “It’s not real fun right now. It’s pretty cold.”

Garrett gathered his players in the middle of the practice field Thursday and said he was challenged by Cowboys executive vice president Stephen Jones. He then said he challenges Washington coach Jay Gruden and Philadelphia coach Chip Kelly. Garrett later said he didn’t challenge Giants coach Tom Coughlin because he has already done it.

“Just challenge those guys in our division,” Garrett said. “They’re great guys. I know them well and I respect them both, so let’s make them uncomfortable the next 24 hours.”

Garrett then counted to three before he lifted an orange Gatorade cooler filled with ice water and dumped it on himself.

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